Fluxed-Core Mod 1.9, 1.8.9, 1.7.10 adds a new potion system, called “Buffs”, Buffs act exactly like potions, but are stored using Strings, this allows for more effects than vanilla potions allow. Another feature this mods adds is, “The Flux Bar”, it adds a bar to Item tooltips and the ingame screen showing how much RF is stored in the current equipped item, There is a config for removing this feature.